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# Official Edexcel C3 Discussion Thread watch

1. (Original post by Woody.)
Okay thanks, I think I get it now, drawing it out helps a lot. Cheers.
Your welcome. By the way, the drawing's in the markscheme as well.
2. If people struggle with ranges/domains, it helps considerably if you have a graphic calculator.
3. (Original post by Noble.)
If people struggle with ranges/domains, it helps considerably if you have a graphic calculator.
Tad late for that now. Are they even allowed as most graphic calcs would do integration/differentiation?
4. (Original post by Noble.)
If people struggle with ranges/domains, it helps considerably if you have a graphic calculator.
Ain't that illegal?
5. (Original post by Woody.)
Tad late for that now. Are they even allowed as most graphic calcs would do integration/differentiation?
Most of the commonly known graphic calculators are allowed such as the Ti-82/Ti-84.
6. (Original post by Get Cape.Wear Cape.Fly.)
Ain't that illegal?
No...
7. if there is a range or domain question it better be worth a little 1 or 2 marks
8. (Original post by Noble.)
No...
You're not allowed graphica calculators though or those that integrate/differentiate. Are you allowed them? Oh.

Ok, I need a new calculator.
9. (Original post by Get Cape.Wear Cape.Fly.)
You're not allowed graphica calculators though or those that integrate/differentiate. Are you allowed them? Oh.
The two main graphic calculators you're not allowed are the Ti-89 and the Ti-92. The rest of them you can use, as long as they don't have integration/differentiation capabilities. It makes drawing graphs, working out ranges/domains very simple.
10. Screw C3 revision. Ima watch 90210 in a minute.
11. (Original post by Superman_Jr)
Screw C3 revision. Ima watch 90210 in a minute.
12. quick question...

e^(t/5) > 25/2

now ln(25/2) > t/5
or ln(25/2) < t/5 ?
13. (Original post by typewriter)
quick question...

e^(t/5) > 25/2

now ln(25/2) > t/5 This is not true. ln(2/25) < t/5 is correct.
or ln(25/2) < t/5 ?
Check the bolded part.
14. anyone got any last minute advice for trig? I never know which identities to use when solving equations...
15. its on the january 2006 c3 paper question 4b

what does 8cos(arcsin(x/4)) convert to?

it shows that it can convert to 2(16-x^2)^0.5

i dont understand how this changes into this...someone explain please!!!
its on the january 2006 c3 paper question 4b

what does 8cos(arcsin(x/4)) convert to?

it shows that it can convert to 2(16-x^2)^0.5

i dont understand how this changes into this...someone explain please!!!
whats the full question???
17. im dreading this... i need an A to help meet my uni offer
18. (Original post by Doughboy)
Check the bolded part.
Thanks, but how come?
its on the january 2006 c3 paper question 4b

what does 8cos(arcsin(x/4)) convert to?

it shows that it can convert to 2(16-x^2)^0.5

i dont understand how this changes into this...someone explain please!!!
There is another way of doing the question:

20. Also help on jan 07 q8

express arcsinx in terms of y ??!!!
how do you get arcsinx = ∏/2 - y ??

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